a/ $\dfrac{SB}{SM}+\dfrac{SD}{SN}=3$
b/ $\dfrac{1}{3} \le \dfrac{V_{S.AMKN}}{V_{S.ABCD}} \le \dfrac{3}{8}$
Edited by shayne ward, 24-08-2011 - 18:21.
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Posted 24-08-2011 - 18:20
shayne ward
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guardian angel
Hình chóp S.ABCD có ABCD là hình bình hành, K là trung điểm SC, mp qua AK cắt SB,SD tại M,N. Cm
a/ $\dfrac{SB}{SM}+\dfrac{SD}{SN}=3$
b/ $\dfrac{1}{3} \le \dfrac{V_{S.AMKN}}{V_{S.ABCD}} \le \dfrac{3}{8}$
a/ $\dfrac{SB}{SM}+\dfrac{SD}{SN}=3$
b/ $\dfrac{1}{3} \le \dfrac{V_{S.AMKN}}{V_{S.ABCD}} \le \dfrac{3}{8}$
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